Design of fuzzy gain scheduling controller for DC motor speed adjustment on spindle CNC milling

Abstract

Load changes happen during the feeding process to form a workpiece. The load changes affect on spindle speed response, so the controller needed to keep the speed at the specified reference value. Fuzzy Gain Scheduling is the load changes control method that used to change the proportional integral (PI) control parameter values. The change of parameter is made through the Fuzzy system. The Fuzzy system is chosen because it is simple in design and does not require complex calculation analysis. The proportional integral (PI) controller that given to a plant, provide time rise (tr) 1.424 seconds and time settling (ts) 1.450 seconds. Whereas using Fuzzy Gain Scheduling controller, the response of the plant produces time rise (tr) 0.650 seconds and time settling (ts) 0.659 seconds. At the time of loading, the speed will decrease and the controller will adapt to give the control action to make the speed return to steady state at the reference value, the time required for the plant with proportional integral (PI) controller to adapt with 0.544 seconds loading, using the Fuzzy Gain Scheduling controller is 0.212 seconds.